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Having atrial fibrillation, a heart problem that causes what is known as an irregular heartbeat, is the leading risk for a stroke. In fact, those with this disease have a heavily increased risk of heart disease: about 20 percent of all people who have strokes suffer from this problem, making it the single biggest contributor. Even worse, people have a 500 percent increased risk of stroke and even higher risk of heart attacks. Sometimes also called a "quivering" beat or arrhythmia, it can cause a variety of heart problems, including blood clots, stroke, heart failure, and heart attacks. T...